At 17:40 on Friday night, the police received an alarm that a grenade had been found by magnetic fishermen in Sandbäckstjärn in Karlstad.

The national bomb squad judged that it was a sharp fire grenade from World War II.

The object was detonated on the I2 firing range by the national bomb squad at 11pm on Friday night.

- There are no criminal suspicions and we will not investigate the incident further, says Mats Öhman, press spokesperson for the Bergslagen police region.